Antonyms of adj 5th

1 sense of 5th

Sense 1
fifth, 5th -- (coming next after the fourth and just before the sixth in position)

INDIRECT (VIA ordinal) -> cardinal -- (being or denoting a numerical quantity but not order; "cardinal numbers")

Similarity of adj 5th

1 sense of 5th

Sense 1
fifth, 5th -- (coming next after the fourth and just before the sixth in position)
       => ordinal (vs. cardinal) -- (being or denoting a numerical order in a series; "ordinal numbers"; "held an ordinal rank of seventh")